Antinode is a point on a standing wave where the wave has a peak amplitude.

The node is a point in the wave where there’s the least displacement. If both waves have the same amplitude then the node will always be 0. If the waves have varying amplitudes, they do not completely balance out and so the node is as similar to 0 as it can be. The node is present on a running graph of a standing wave, at the points where the line seems to remain stationary.

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The difference between the nodes is around half a wavelength, or
λ/2.

The antinode is a point in the standing wave where the most important displacement is. It exists in the center of each node, so the interval between each antinode is λ/2.